MOCT-P Optical Current Transformer System

72.5-800 kV Systems, 50/60 Hz

ApplicationThe Magneto-Optic Current Transformer for Protection (MOCT-P) is a passive optical current transducer which uses light to accurately measure current on high voltage systems. The MOCT-P system is suitable for outdoor application and has a continuous current rating up to 3150 A with an accuracy limit factor of 40 x. It meets the protection class accuracy 5TPE, according to IEC 60044-8. The electronic unit 2100-PI uses ABB’s patented dual-direction approach to make the output signal insensitive to shock and vibration. The optical design enables accurate reproduction of fully offset fault currents with decaying d.c. component without saturation or other source of distortion.

The MOCT-P system provides a 200 mV voltage output for use with protective relays.

• Three phases of MOCT-P sensors mounted on polymer insulator columns with preterminated fiber optic cable in the insulator.

• Electronic MOCT-P signal processing module 2100-PI suitable for installation in the substation control house.

• Fiber optic cables for transmission of the light signals between the optical sensors and the MOCT-P electronic

module.

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MOCT System Configuration

Benefits of the MOCT-P Optical Current Transducer SystemThe MOCT-P system can satisfy current sensing needs for protective relaying in a wide variety of applications. Following is a list of key benefits:

• No requirement for oil or gas insulation system, environmentally safe.

• Shunt-like reproduction of fully offset fault current with decaying d.c. component with high accuracy and no saturation or other sources of distortion.

• Improved safety with no mechanism for failure or open secondary.

• Significantly smaller size and lighter weight than oil- or SF6-

insulated equipment.

• Total isolation from surges for microprocessor-based meters and relays.

• No magnetic core ferroresonace or saturation limits.

Product Bulletin | MOCT-P Optical Current Transformer System 3

All dimensions in inches unless specified otherwise

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For more information please contact: ABB Inc. High Voltage Products - Optical Sensors and SystemsWestmoreland Distribution Park East100 Distribution Circle Mount Pleasant, Pennsylvania 15666, USA Phone: +1 (724) 696-1500 Fax: +1 (724) 696-1502 www.abb.com